Concept, complete with animated proxy model, of an anti aircraft unit with RTS-ish proportions, synthesizing some things I learned on End of Nations and Grey Goo.

Good RTS unit design is like an extension of the UI, giving clear indications of facing, aggro, and alt states to avoid cumbersome overlays and localization difficulties.

While it may not be typical to do animation as part of the concept art pipeline, it can be useful. Designs can be iterated directly, speeding up turnaround and getting preliminary models into grey box builds early.